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Twelve - inch scale in case, by "Donkin, London"

Linear scale and folding square with quadrant arc

1757

Triangular ivory scale

Holtzapffel's "Library sketching or pocket-book scale", with descriptive leaflet, date 1849

Holtzapffel's "Library sketching or pocket-book scale"

1849
Weighing scales, 30lb capacity, by W & T Avery, Birmingham, c.1960, modified to operate as spring tension tester for BR Mark 7 single action slam carriage locks, used at Selhurst Depot until 1992.

Weighing scales

1960